The following is a photo tutorial on mounting resin spade grips handles on a set of TNW spade grips The process is the same for all spade grips using 5/8" mounting tubes.
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Images can be enlarged by clicking on them.

TNW spade grips as shipped. The handle tubes and drilled truss head spanner screws are GI. If you need information on removing the screws, click HERE.

Be very careful when removing the tubes. When fully assembled the brackets and handles are sturdy, but once the screws are removed a great deal of stress can be put on just one bracket. The top bracket on the TNW spade grips is secure, but could be broken away from back plate if bent. The tubes are very snug so it's probably best to remove both spanner screws and then separate the brackets just enough to pull the handle/tube assembly out sideways rather than try to drive the tube out one end.

Once the handles and tubes have been removed, replace one of the spanner screws and then use a wooden dowel and a small leather mallet or hammer to gently tap the tubes out of the handles.
Turn the spade grips upside down and using a punch, locate the point where the bracket will be drilled for the set screw. I tapped the hole for a threaded section of an 8/32 button head screw. A #29 (9/64") drill bit was used which fit easily in the space between the hole and the outer edge of the spanner screw.
The holes have been drilled and tapped.
I drilled and tapped a piece of 1/8" x 1/2" steel to hold the button head screws while I made the necessary modifications. With the button head screw installed as shown in the photo, I ground a shallow point on the end of the screw. I backed out the screw until just the point was protruding, then used a Dremel tool to cut off the screw flush with the steel, then backed it out a bit and used the same fiber blade to cut a slot in the end for a screwdriver.

The finished Set screw.

Here the screw is installed flush with the bottom and the point protruding. I tightened the spanner screws just enough to snug up the handles but not so tight that the handle wouldn't rotate.

NOTE: Set the screw to the proper depth and then draw the assembly together by tightening the spanner screw. It is easier than trying to set the screw to depth after the assembly is together for the simple reason that you can apply more torque to the spanner screw than the small set screw.
Using a protractor I set the handle at a 15 degree angle and then tightened the bottom spanner screw. I then flipped the protractor over and did the other handle.
That's it. You can try simply installing the handles and tightening the spanner screws. As shipped the round walnut handles were so tight they would not rotate and you may find the set screw unnecessary.
A note about the fit of new TNW spades. The spades I installed handles on had a very rigid action - so much so I thought it possible that the linkage might actually hold the trigger in the "fire" position. As these spades were going on a full auto 1919A4 this was potentially a serious safety issue. I drifted out the roll pin and widened the holes in the trigger assembly. I left the holes in the butterfly spade (red arrows) alone so the roll pin would maintain a tight fit. An easy fix and the action on the spades feels very smooth..
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